While the details are covered in-depth in this section, here are some quick
references to variables for the impatient: for engines, see
org-latex-compiler; for build sequences, see
org-latex-pdf-process; for packages, see
org-latex-default-packages-alist and org-latex-packages-alist.

An important note about the LaTeX export back-end: it is sensitive to
blank lines in the Org document. That's because LaTeX itself depends on
blank lines to tell apart syntactical elements, such as paragraphs.